Servlet unavailable after restart

[Steve Leach]

Hi all
I have a JSP/Servlet application that is working fine under Tomcat 4, except that if I restart the application (using an Ant task or the Tomcat Manager app) I will just get "Servlet MainServlet is currently unavailable" exceptions.
MainServlet is my controller servlet.
The only thing I can find in the logs are a number of exceptions, all the same, that I don't understand

  
WebappClassLoader: Lifecycle error : CL stopped
java.lang.Exception: Stack trace
at java.lang.Thread.dumpStack(Thread.java:1064)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1329)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1289)
at org.apache.commons.logging.impl.LogFactoryImpl$1.run(LogFactoryImpl.java:460)
at java.security.AccessController.doPrivileged(Native Method)
at org.apache.commons.logging.impl.LogFactoryImpl.loadClass(LogFactoryImpl.java:454)
at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:406)
at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:525)
at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:272)
at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:246)
at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:395)
at org.apache.tomcat.util.net.jsse.JSSESupport.<init>(JSSESupport.java:87)
at org.apache.tomcat.util.net.jsse.JSSE14Support.<init>(JSSE14Support.java:99)
at org.apache.tomcat.util.net.jsse.JSSE14Factory.getSSLSupport(JSSE14Factory.java:84)
at org.apache.tomcat.util.net.jsse.JSSEImplementation.getSSLSupport(JSSEImplementation.java:118)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:385)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:565)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:619)
at java.lang.Thread.run(Thread.java:534)

A web search locates a few references to lifecycle errors, mainly in discussion forums, but I can't find a solution anywhere.
On my WinXP laptop implementation I can restart fine, with no problems. Same app, same config (as near as I can make out).
Cheers
Steve

[Steve Leach]

I just found a reference to a Tomcat hotfix for this issue.
HotFix
That seems to fix the problem. I'll keep an eye on it and see what happens.